Help ASAP! Forth week of flower severe yellowing

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CodyHG22

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Looking for some insight. Thought it might be from a nutrient lockout when it was first appearing. Did a flush and let them dry before I stated them back on nutrients. That was a few days ago and I’m still seeing progression in the affected leafs
 

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HydoDan said:
Affected leaves will not recuperate, look at newer growth for improvement..
Do a flush and cut your EC in half..
Click to expand...
So you think it is efficiency of nutrients? What shows you that? This is my first round in and I am trying to learn as much as I can
 
CodyHG22 said:
So you think it is efficiency of nutrients? What shows you that? This is my first round in and I am trying to learn as much as I can
Click to expand...
Kinda doubt nutrients are the issue more likely your watering practices
Letting them dry is concerning if you mean you let them wilt
 
Damaged leaves do not recover. You should observe new growth to monitor your problem not expect damaged leaves to recover. 2.5 ec seems high but I defer to others who follow your nutrient regimen.
 
CodyHG22 said:
So you think it is efficiency of nutrients? What shows you that? This is my first round in and I am trying to learn as much as I can
Click to expand...

Shit man there’s your problem, first time around hydro (I’m assuming flood & drain) and high ass feed. Is your ph in check(should be 5.6-5.8 )? Not talking shit it’s easy to get ahead of your skills and knowledge when you’re enthusiastic about something and growing weeds exciting to start.
 
My advice seeing how small they are I’m guessing you didn’t put a lot veg time in em is chop em toss em and start over with something more basic. Most economic route would be peat or coco with perlite or vermiculite if peat with 1/4cup lime per 10 gallons if coco make sure you buffer with calmag. Then feed at proper ph for whichever media with a balanced fertilizer at the correct level for growth stage seedling .4-.6 up to 1.2 in veg probably won’t need to go much higher in flower unless you’re pushing everything else (lights, co2)

hydro Is cool, but there are so many failure points to take into consideration. Like res temp(63f-72f), ph drift and in the case of flood tables fertigation timing it’s basically designed for new or budget growers to fail at.
 
You have potassium deficiency. The number one antagonist of potassium in Cannabis is Calcium.

Don't listen to anyone who diagnoses "ph". Never in my 30+ years have I said "yup, it's the ph" It doesn't even make sense. A bunch of kids with calcium toxic plants playing armchair nutrient detective with crackerjack credentials.

Anyone offering real advice will be able to tell you what nutrients are imbalanced. And they aren't going to be interested in the cause behind it, that's up to you. It might be oh related, but it's not. It's never been. Every Cannabis grow I look at is calcium toxic. Cannabis hyper accumulates calcium.
 
If your flood and drain the cubes without a top-down flush develops really high EC around the top of the cube if you're running 2.5 you could easily be touching 4 at the top 1/3 of the cube, Rockwool should be top feed and the moisture content of the cube kept in check with frequent small volume irrigation shots, this way high EC is continually pushed through the medium as a layer and in a wet enough state to not build-up salts with minimum run-off.

They look salt burned to me, maybe the irrigation is not in tune with the EC and moisture levels causing EC spikes and really high EC pockets in the medium, irrigation is not just make run-off, its got to mesh with a moisture zone for the medium, when this gets out of balance lots of things can start to go south.

I don't grow in Rockwool although I have but the rules are pretty much all the same, the plant has a happy zone our job is to create it.
 
Athena recommends like 3 EC if I remember correctly, it's possible they are hungry but unlikely with their size @ 2.5 EC. Sometimes nutrient toxicity can appear as deficiency in some ways. I would say in this case they are burnt and not deficient. I quit running athena dry shit cause the plants never looked right for me. I'm a big noob or something idk. I had the same issue with Jacks @ Recommended EC but reducing the Jacks RO formula to 1.0 EC seemed to fix everything.. Mixing into RO the pH was always 6.0 @ 1.0 EC. Never adjusted just fed to plants and they did pretty good.

This all depends on if you're feeding every time you water, every day, etc.. Lots of variables.
 
GrodanLightfoot said:
You have potassium deficiency. The number one antagonist of potassium in Cannabis is Calcium.

Don't listen to anyone who diagnoses "ph". Never in my 30+ years have I said "yup, it's the ph" It doesn't even make sense. A bunch of kids with calcium toxic plants playing armchair nutrient detective with crackerjack credentials.

Anyone offering real advice will be able to tell you what nutrients are imbalanced. And they aren't going to be interested in the cause behind it, that's up to you. It might be oh related, but it's not. It's never been. Every Cannabis grow I look at is calcium toxic. Cannabis hyper accumulates calcium.
Click to expand...
"Calcium requirements are almost 3 times higher for dicots than for monocots (grasses). Calcium is nontoxic, even at high tissue concentrations, but it accumulates in solution if too much is added to the refill solution."
 

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